Feature: <br>This focusing helicoid tube is made of good metal, sturdy and durable, equipped with standard M42 mount. <br>The length of this helicoid tube is adjustable, it offers a distance for lens focusing adjustment, easy to use. <br>This helicoid tube is useful for those lenses without focus ring. <br>It could be used as macro barrel and offers fine focus control for macro photography. <br>It will be better when you use it with filter adapter together. <br> <br> <br> <br> <br>Specification: <br>Material: Aluminium Alloy <br>Color: Black <br>Options(Adjusting Length): 12-17mm; 17-31mm; 25-55mm; 36-90mm <br>Size/Diameter: Approx. 5.8cm / 2.28inch <br>Weight: Approx. 57-102g <br> <br>Package list: <br>1 x Focusing Helicoid Adapter<br>1、This focusing helicoid tube is made of good metal, sturdy and durable, equipped with standard M42 mount <br>2、The length of this helicoid tube is adjustable, it offers a distance for lens focusing adjustment, easy to use <br>3、This helicoid tube is useful for those lenses without focus ring <br>4、It could be used as macro barrel and offers fine focus control for macro photography <br>5、It will be better when you use it with filter adapter together